Cadmium (Cd, Z = 48)
Métal de transition Bloc d Groupe 12 Période 5 Solide (CNTP)
Cadmium is a chemical element with symbol Cd and atomic number 48. This soft, bluish-white metal is chemically similar to the two other stable metals in group 12, zinc and mercury. Like zinc, it prefers oxidation state +2 in most of its compounds and like mercury it shows a low melting point compared to transition metals.
Découvreur : Karl Samuel Leberecht Hermann
Propriétés physiques
- Masse atomique standard
- 112,4 u
- Densité
- 8,650 g/cm³
- Point de fusion
- 594,2 K
- Point d'ébullition
- 1 040,0 K
- Chaleur molaire
- 26,02 J·mol⁻¹·K⁻¹
- Électronégativité (Pauling)
- 1,690
- Affinité électronique
- -68,00 kJ/mol
- Énergies d'ionisation
- 868 ; 1 631 ; 3 616 kJ/mol
- Configuration électronique
- [Kr] 4d10 5s2
- Électrons par couche
- K : 2 · L : 8 · M : 18 · N : 18 · O : 2
- Aspect
- silvery bluish-gray metallic
Correspondance ANU historique / conjectural
Comptage de la Chimie Occulte (1908) : 2 016 ANU (atomes ultimes), soit N/18 = 112,00 — masse « noologique » à comparer à la masse standard 112,414 u et à l'isotope dominant 114Cd. Coefficient k(Z) = 0,970 · multiple de 18
Matériel historique et conjectural — voir la page Pont ANU ↔ Nucléides.
Isotopes (42)
| Nucléide | A | N | Masse (u) | Abondance (%) | Demi-vie | Spin | Parité | Magique |
|---|---|---|---|---|---|---|---|---|
| 94Cd | 94 | 46 | 93,956586 | — | — | 0 | ⁺ | — |
| 95Cd | 95 | 47 | 94,949483 | — | 32 ms | 9/2 | ⁺ | — |
| 96Cd | 96 | 48 | 95,940341 | — | 1003 ms | 0 | ⁺ | — |
| 97Cd | 97 | 49 | 96,934799 | — | 1.16 s | 9/2 | ⁺ | — |
| 98Cd | 98 | 50 | 97,927389 | — | 9.29 s | 0 | ⁺ | N magique |
| 99Cd | 99 | 51 | 98,924926 | — | 17 s | 5/2 | ⁺ | — |
| 100Cd | 100 | 52 | 99,920349 | — | 49.1 s | 0 | ⁺ | — |
| 101Cd | 101 | 53 | 100,918586 | — | 1.36 min | 5/2 | ⁺ | — |
| 102Cd | 102 | 54 | 101,914482 | — | 5.5 min | 0 | ⁺ | — |
| 103Cd | 103 | 55 | 102,913417 | — | 7.3 min | 5/2 | ⁺ | — |
| 104Cd | 104 | 56 | 103,909856 | — | 57.7 min | 0 | ⁺ | — |
| 105Cd | 105 | 57 | 104,909464 | — | 55.5 min | 5/2 | ⁺ | — |
| 106Cd | 106 | 58 | 105,906460 | 1,2450 | stable | 0 | ⁺ | — |
| 107Cd | 107 | 59 | 106,906612 | — | 6.5 h | 5/2 | ⁺ | — |
| 108Cd | 108 | 60 | 107,904184 | 0,8880 | stable | 0 | ⁺ | — |
| 109Cd | 109 | 61 | 108,904987 | — | 461.3 j | 5/2 | ⁺ | — |
| 110Cd | 110 | 62 | 109,903007 | 12,4700 | stable | 0 | ⁺ | — |
| 111Cd | 111 | 63 | 110,904184 | 12,7950 | stable | 1/2 | ⁺ | — |
| 112Cd | 112 | 64 | 111,902764 | 24,1090 | stable | 0 | ⁺ | — |
| 113Cd | 113 | 65 | 112,904408 | 12,2270 | 8.04 Pa | 1/2 | ⁺ | — |
| 114Cd | 114 | 66 | 113,903365 | 28,7540 | stable | 0 | ⁺ | — |
| 115Cd | 115 | 67 | 114,905437 | — | 53.46 h | 1/2 | ⁺ | — |
| 116Cd | 116 | 68 | 115,904763 | 7,5120 | 26.9 Eyear | 0 | ⁺ | — |
| 117Cd | 117 | 69 | 116,907226 | — | 2.503 h | 1/2 | ⁺ | — |
| 118Cd | 118 | 70 | 117,906922 | — | 50.3 min | 0 | ⁺ | — |
| 119Cd | 119 | 71 | 118,909847 | — | 2.69 min | 1/2 | ⁺ | — |
| 120Cd | 120 | 72 | 119,909868 | — | 50.8 s | 0 | ⁺ | — |
| 121Cd | 121 | 73 | 120,912964 | — | 13.5 s | 3/2 | ⁺ | — |
| 122Cd | 122 | 74 | 121,913459 | — | 5.24 s | 0 | ⁺ | — |
| 123Cd | 123 | 75 | 122,916892 | — | 2.1 s | 3/2 | ⁺ | — |
| 124Cd | 124 | 76 | 123,917660 | — | 1.25 s | 0 | ⁺ | — |
| 125Cd | 125 | 77 | 124,921258 | — | 680 ms | 3/2 | ⁺ | — |
| 126Cd | 126 | 78 | 125,922430 | — | 512 ms | 0 | ⁺ | — |
| 127Cd | 127 | 79 | 126,926203 | — | 480 ms | 3/2 | ⁺ | — |
| 128Cd | 128 | 80 | 127,927817 | — | 246 ms | 0 | ⁺ | — |
| 129Cd | 129 | 81 | 128,932236 | — | 147 ms | 3/2 | ⁺ | — |
| 130Cd | 130 | 82 | 129,934388 | — | 126.8 ms | 0 | ⁺ | N magique |
| 131Cd | 131 | 83 | 130,940728 | — | 98 ms | 7/2 | ⁻ | — |
| 132Cd | 132 | 84 | 131,945823 | — | 84 ms | 0 | ⁺ | — |
| 133Cd | 133 | 85 | 132,952614 | — | 61 ms | 7/2 | ⁻ | — |
| 134Cd | 134 | 86 | 133,957638 | — | 65 ms | 0 | ⁺ | — |
| 135Cd | 135 | 87 | 134,964766 | — | stable | 5/2 | ⁻ | — |
Liseré coloré en première colonne : vert = stable, jaune = demi-vie > 1 an, orange > 1 jour, rouge < 1 jour.